Determining stoned driving a thorny issue

1/8/17–Concerns about marijuana-impaired driving and the difficulties in proving marijuana intoxication are likely 2017 agenda items for lawmakers seeking public-safety changes to the marijuana legalization law approved by voters in November. Science has not yet produced a measure of marijuana intoxication on par with the blood-alcohol-content tests, which provide reliable readings of someone’s sobriety or drunkenness. Read